1661433594 has 16 divisors (see below), whose sum is σ = 3335504832. Its totient is φ = 551704928.

The previous prime is 1661433593. The next prime is 1661433617. The reversal of 1661433594 is 4953341661.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661433593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524859 + ... + 528014.

It is an arithmetic number, because the mean of its divisors is an integer number (208469052).

Almost surely, 2^1661433594 is an apocalyptic number.

1661433594 is an abundant number, since it is smaller than the sum of its proper divisors (1674071238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661433594 is a wasteful number, since it uses less digits than its factorization.

1661433594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053141.

The product of its digits is 233280, while the sum is 42.

The square root of 1661433594 is about 40760.6868685993. The cubic root of 1661433594 is about 1184.3889017418.

The spelling of 1661433594 in words is "one billion, six hundred sixty-one million, four hundred thirty-three thousand, five hundred ninety-four".